子阵幅度加权的低副瓣技术研究  

Low Side-lobe Technology Study Based on Sub-array Amplitude Weighting

作　　者：闫秋飞[1] 范国平[2] 徐朝阳[2] 

机构地区：[1]江苏科技大学,镇江212003 [2]船舶重工集团公司723所,扬州225001

出　　处：《舰船电子对抗》2009年第6期62-65,共4页Shipboard Electronic Countermeasure

摘　　要：在大型相控阵天线中采用子阵幅度加权来降低副瓣是一项简单且实用的技术,并且成本较低,但是在副瓣区域会出现高量化瓣(栅瓣)。如果在阵元级进行幅度加权,就不会出现量化瓣,且会取得非常好的低副瓣的效果。但是由于大型相控阵天线阵元数目比较多,所以采用阵元幅度加权馈电系统会比较复杂,而且成本较高。解决这个问题一个折中的方法就是在子阵进行幅度加权,同时在每个子阵中具有相同序号的阵元加权相同的系数,然后利用子阵系数和阵元系数的乘积来近似只有在阵元进行加权时的期望加权系数。这个近似的方法要比单独采用子阵幅度加权的副瓣电平好(在这里假设所有的子阵都是均匀子阵)。该设计比全部阵元幅度加权简单,而且降低了成本。It s a simple and practical technology to reduce side-lobes in large phased-array antenna by adopting sub-array amplitude weighting,which has lower cost,but will generate high quantized lobe（grating lobe）.The quantized lobe will not appear if the amplitude weighting is performed in the element outputs,and the perfect effect of low side lobe will be fetched.But the feed system is complicated and expensive by adopting element amplitude weighting feed system because of more elements of phased-array antenna. There is an eclectic method to solve this problem, which is to perform the amplitude weighting in the sub-array,at the same time the element that has the same number weights the same coefficient in each sub-array,then uses the product o{ the sub-array coef- ficient and element coefficient to approximate the expected weighting coefficient only when the ele- ment performs weighting. This approximate method is better than that of the side-lobe level adopting the sub-array amplitude weighting alone （suppose any element is an even sub-array）. This design is simpler and cost lower than all element outputs amplitudes weighting.

关 键 词：低副瓣 幅度加权 子阵 栅瓣 

分 类 号：TN958.92[电子电信—信号与信息处理]